Snow plow



Dec. 29, 1936. F. v. LEs'rlNA SNOW PLOW Filed July 30, 1936 2Sheets-Sheet 1 WNY 3 3 3 C 3v. C E C E E M! MWI v NI wwf ATTORNEYS Dec.29, 1936.

F. v. I EsTlNA SNOW PLOW Filed July 50, 1956 2 Sheets-Sheet 2 INVENTORATTORNEYS Patented Dec. 29, 1936 UNITED'STATES PATENT OFFICE SNOW PLOWFrank V. Lestina, Monona, Iowa Application July 30, 1936, Serial No.93,495

2 Claims.

This invention relates to snow plows and has for an object to provide asnow plow having a vertical spiral cutter and having diverging screwcarriers on opposite sides of a deflector in rear of the cutter adaptedto remove the snow dislodged by the cutter and deect it rearwardly andto the sides of the tractor or other motor vehicle t0 which the snowplow may be applied.

A further object is to provide a simplified snow plow the moving partsof which may be power driven from a suitable shaft on the tractor orother motor vehicle and which will be formed of a few strong simple anddurable parts, which will be easy to manufacture, and which will noteasily get out of order.

With the above and other objects in View the invention consists ofcertain novel details of construction and combinations of partshereinafter fully described and claimed, it being understood thatvarious modifications may be resorted to within the scope of theappended claims without dep-arting from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawings forming part of this specification,

Figure 1 is a side elevation of a snow plow constructed in accordancewith the invention and applied to a caterpillar tractor.

Figure 2 is a plan view of the snow plow and tractor shown in Figure 1.

Figure 3 is a vertical sectional view taken on the line 3-3 of Figure llooking in the direction of the arrowheads.

Figure 4 is a longitudinal sectional view of the snow plow.

Figure 5 is a detail elevation of the rear supporting bracket of thesnow plow.

Figure 6 is a detail perspective View of the bottom cutting blade.

Figure '7 is a fragmentary detail elevation of one of the screwcarriers.

Figure 8 is a detail sectional View showing one of the knife blades onvthe front vertical cutter.

Figure 9 is a cross sectional View taken on the line 9-9 of Figure 8looking in the direction of the arrowheads.

Referring now to the drawings in which like characters of referencedesignate similar parts in the various views, Ill designates aconventional Caterpillar tractor, to which the snow plow is illustratedas being applied.

The snow plow comprises a bottom plate II, which is inclined upwardlyfrom front to rear, as shown best in Figure 4. A rear A-shaped bracketI2, shown in elevation in Figure 5, has the leg bolted at the bottom tothe base plate as shown at I3 in Figure 1. A bearing box I4 is mountedon top of the bracket to journal the rear end of a power shaft I5. Thebracket is 5 1 braced by a diagonal brace I 6 which extends from thebase plate to the top of the bracket.

A substantially rectangular frame I'I is mounted on the front of thebottom plate and has the sides I8 sloped rearwardly as best shown inFig- 10 ure l. The bottom of the frame may be secured to the base platein any preferred manner and the top of the frame is provided on theunderneath sides with a gear case I9, best shown in Figures 1 and 4, inwhich the forward end of the 15 power shaft I5 is journaled.

A vertical screw cutter 20 has the shaft 2I thereof journaled in ballbearings 22 and 23 mounted respectively in the gear case and on the baseplate. The power shaft I5 is geared to 20 the shaft of the cutter bybevel gears 24 and 25. The spiral blade of the cutter is equipped atdiametrically opposite points with upstanding knives 2B having angularlydirected lower ends 2I bolted as shown at 28 in Figure 8, to the spiral25 blade of the rotary cutter.

A pair of cross braces 29, best shown in Figure 2, are bolted at thefront ends to the top of the front supporting frame I'I and are boltedat the rear ends to the-bearing box I 4 of the rear A- 3o shaped bracketI2 to rigidly secure these parts in. place. A diagonal brace bar 30,best shown in Figure 1, is connected at the upper end to the top of thefront supporting frame and is connected at the rear end to the rearportion of the base 35 plate to further rigidly anchor the frontsupporting frame in place. This brace bar intersects the beforementionedbrace bar I6 which braces the rear A-shaped bracket I2, as best shown inFgure 4.

A deector 3l of substantially inverted V- shaped cross section, as bestshown in Figure 3, is bolted to the base plate, as shown at 32` inFigure 4, the sides of the deflector gradually increasing in height fromfront to rear, as best shown in the l-ast named figure. The lateraledges of the delector at the rear upper end are curved outwardly toprovide wings 33 which deect the snow laterally from the rear end of thesnow plow.

The bottom front end of the deector is provided with spaced bearingboxes 34, as best shown in Figures 1 and 2, which receive the lower endsof screw carriers 35 which are mounted in respective troughs 36 fixed tothe deflector, and 55 extending upwardly toward the rear of the deector.The carriers diverge from e-ach other and are adapted to lift the snowdislodged by the front vertical cutter and carry it upwardly andrearwardly to the wings 33 which as heretofore mentioned deect the snowoutwardly beyond the sides of the snow plow.

As best shown in Figure 2, the upper ends of the shafts 31 of the screwcarriers are journaled in suitable bearings 38 formed in an irregularshaped cross bar Y39 which is mounted at the upper rear end of the snowplow by means of extensions 40 of the diagonal brace bars 29, theseextensions being continued rearwardly as shown at 4I and bolted as shownat 42 to any convenient part of the tractor. The cross bar 33 is alsosecured to the tractor by upright brace bars 43, as best shown in Figure1.

As also best shown in Figure 2 the cross bar 39 is equipped with sleeves44 in which are journaled stub shafts 45 the outer ends of which aregeared to the shafts 31 of the screw or worm carriers, by means ofmeshing bevel gears 46 f and 41. The inner ends of the stub shafts 45are geared to the power shaft I5 through the instrumensimultaneouslydrive the vertical cutter 20 and both screw carriers 35, as best shownin Figure 4.

In operation as the snow plow is pushed forwardly by the Caterpillartractor on the roadway the vertical rotary cutter will dislodge andbreak up the snow which, as the snow vplow advances, will be deflectedby the deflector 3l into the troughs 36 and carried upwardly andrearwardly by the screw carriers 35 to the wings 33 which dei-lect thesnow in endless streams later ally toward the sides of the roadway.

From the above description it is thought that the construction andoperation of the invention will be fully understood without furtherexplanation.

Wh-at is claimed is:

1. In a snow plow, a cutter having spirally arranged vertical blades,screw carriers diverging upwardly and rearwardly from the bottom of thecutter, an'arched deflector in rear of the cutter supporting thecarriers, and means for simultaneously rotating the cutter and thecarriers.

2. In a snow plow, a base plate, a vertical spiral cutter on the frontof the plate, upstanding knives on the spiral body of the cutter,diverging screw carriers extending obliquely upward from the base platein rear of the cutter, a delector on the base plate supporting thecarriers and gradually increasing in height and width from the cutter tothe rear end of thelbase plate, troughs on the deector housing thecarriers, and means for simultaneously rotating the cutter and thecarriers.

FRANK V. LESTINA.

